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TrashGeologist t1_j6pbnde wrote

Reply to comment by Eithersnore in Eli5: when will oceans actually start rising? by Just_a_happy_artist

NOAA can use satellites that send down signals and measure the time it takes for it to bounce back. Same idea as a laser measurer you might use around the house, only a lot more lasers in a lot more places over a long period of time

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